Improvement in alaem locks



@uiten tetes strnt @fitta Laws rami No. 62,683, @am ata-@t s; isc?.

MPROVEMENT IN ALARM LOCKS.

lith-c dicbulc rotura lo' in ilgrsc tctus ilntnu mit mating putt ,uftige' smite,

mTo ALL WHOM ir MAY concurrir;

Be it known that We, JAMES S. PORTER and RUssuL Ponrnn, of Waterford, inthe county of Saratoga, and State of New York, have invented new anduseful improvements in Looks g and we do hereby declare that thefollowing is a full, clear, and exact description thereof, which willenable others skilled in the art to make and use the same, referencebeing'had to the accompanying drawings forming part of thisspecification. K

The present invention consists, Erst, of a combination with a lock of apistol in such a manner that when a key is placed in the lock and turnedfor the purpose of unlocking it, the pistol will be discharged, thusoperating as an alarm g v second, in arranging a cam in the lock-easingin such a manner that it can be brought to bear against the key when inthe lock, to prevent its being turned; and, third, in so hanging a platein the lockcasing that it can be swung across the key-hole of the same,and thus prevent the insertion of a key therein from the outside of thedoor. In accompanying plate oi' drawings our improvements areillustrated--h Figure l being a view of the inside of the lock, and

Figure 2, a view of the outside of the leck-casing- Similar letters ofreference indicate like parts.

A, in the drawings, represents the leek-casing; B, the sliding-bolt ofthe same, which may be arranged in any of the usual modes now practisedtherefor. C is a pistol-barrel, secured in the lock-casing, with itsmuzzle at one endof the lock-casing, so that it can be loaded orcharged. This pistol, at its inner end, is provided with a nipple, D, toreceive a cap for the placing of which thereon a hole, E, is made in oneofthe side-plates of the lock-casing, which hole E is closed by Aascrew-stopper or plug, F. G, a hammer for exploding the cap on thenipple D, and consequently the charge inthe pistol, which hammer is hungupon a 'Fulcrum on the inside of the lock-casing, and at one end is hungor pivotcd to a latch, H, that, when the hammer is to be set, isinterlocked by its notch I with a fixed pin, J, resting by its tail endK upon the trigger-lever L, which is so hung in the lock-casing as to beoperated by the key, when placed in the key-hole of the lock and turnedin such a manner as to throw the latch H oli' the pin J, and thussetting the hammer G free, allow its spring M to lthrow it down and uponthe nipple ofthe pistol with sui'iicient force to discharge the contentsof the same. The latch is provided with a spring, N, to hold it iirmlyengaged with the pin. To enable the hammer to be set, as aboveexplained, the upper edge or side of the lockcasing is provided with aslide or cover, O, in a position which, when opened, will allow'thelatch H to be engaged with the pin. P, a cam, hung in the lock-casing,and projccting by its handle Q below the same, which cam-lever, whenswung towards the key-hole of the lock, can be brought to bearagainsttheside of the key therein, and rmly hold it so that it cannot beturned' until swung Y out of thc way. To cover the key-hole, and thusprevent the insertion of a key in the lock from the outside of the doorto which the lock is attached, when there is no key in the lock, We havehung upon the inside of the lock a plate or guard, R, in such a positionthat when taken by its handle S, projecting below the under side of thelock, it can bc swung across the key-hole, andthus cover the same, asuitable device bein-g provided for holding the said plate across oraway from the key-hole, as the case may be. l

What we claim as new, and desire to secure by Letters Patent, is-

1. The pistol C, hammer G, latch H, and trigger L, when all arranged andcombined within the interior of a lock-casing provided with a cover, O,and plug Fsubstantial1y in the manner and for the purpose described.

2. The cam l), substantially as and for the purpose described.

JAMES. S. PORTER, RUSSEL PORTER.

Witnesses t Tnoinis Bnoons, SAMUEL LANnsnouounn.

